Goodwill and Other Intangible Assets (Details) - Narrative (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill [Line Items]
Impairment	$ 0	$ 429,020,000	$ 0
Goodwill	392,882,000	391,498,000	822,247,000	826,009,000
Gross goodwill	1,800,000,000
Accumulated impairment loss on goodwill	$ 1,400,000,000
Estimated performance period	10 years